If you are using the same settings on your 3D printer, but all of a sudden your prints start failing, you might be wondering what is going on. Here are some possible causes and solutions to troubleshoot your 3D printing problems.

• Check the filament. Sometimes the filament can get tangled, kinked, or broken, which can affect the quality of your prints. Make sure the filament is feeding smoothly and evenly into the extruder. If the filament is brittle or has moisture in it, you might need to replace it or dry it out.
• Check the nozzle. The nozzle is the part that melts and deposits the filament onto the print bed. If the nozzle is clogged, dirty, or damaged, it can cause under-extrusion, blobs, stringing, or other issues. You can try to clean the nozzle with a needle or a wire brush, or replace it if it is worn out.
• Check the bed leveling. The bed leveling is the process of adjusting the distance between the nozzle and the print bed. If the bed is not level, it can cause the first layer to be uneven, which can affect the adhesion and accuracy of your prints. You can use a piece of paper or a feeler gauge to check the gap between the nozzle and the bed at different points, and adjust the screws or knobs accordingly.
• Check the temperature. The temperature is one of the most important factors that affect the quality of your prints. If the temperature is too high or too low, it can cause warping, cracking, stringing, or other issues. You can use a thermometer or a thermal camera to check the temperature of the nozzle and the bed, and adjust them according to the recommended settings for your filament type and model.
• Check the speed. The speed is another factor that affects the quality of your prints. If the speed is too fast or too slow, it can cause over-extrusion, under-extrusion, ringing, or other issues. You can use a stopwatch or a software to check the speed of your printer, and adjust it according to the complexity and size of your model.